package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;

    /*
     * 用户登录
     * */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 1. 获取openId
        String openId = getOpenId(userLoginDTO.getCode());
        // 2.判断openid是否为空，决定是否进行
        if (openId == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        // 3.根据openId查询用户信息
        User user = userMapper.getByOpenId(openId);
        // 4.判断用户是否存在
        if (user == null) {
            // 如果账号不存在，说明没有注册过，进行自动注册
            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.save(user);

        }
        return user;
    }

    /*
     * 调用微信登录接口服务，获取微信用户的openId
     * */
    private String getOpenId(String code) {
        // 调用微信接口服务，获取当前用户的OpenId
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");

        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }

}
